<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>koa练习</title>
    <link rel="stylesheet" href="/static/css/bootstrap.min.css">
    <script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
    <script src="/static/js/bootstrap.min.js"></script>
</head>
<body>
    {% block header %} <h3>Unnamed</h3> {% endblock %}
    {% block body %} <div>No body</div> {% endblock %}
    {% block footer %} <div>copyright</div> {% endblock %}
</body>
</html>